 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.views.properties;

 import org.eclipse.core.resources.IFile;
 import org.eclipse.jface.viewers.IBasicPropertyConstants;
 import org.eclipse.osgi.util.TextProcessor;
 import org.eclipse.ui.internal.ide.dialogs.IDEResourceInfoUtils;

 /**
  * The FilePropertySource gives the extra information that is shown for files
  */
 public class FilePropertySource extends ResourcePropertySource {

     private static PropertyDescriptor fileDescriptor;
     static {
         fileDescriptor = new PropertyDescriptor(
                 IResourcePropertyConstants.P_SIZE_RES,
                 IResourcePropertyConstants.P_DISPLAY_SIZE);
         fileDescriptor.setAlwaysIncompatible(true);
         fileDescriptor
                 .setCategory(IResourcePropertyConstants.P_FILE_SYSTEM_CATEGORY);
     }

     /**
      * Creates an property source for a file resource.
      * @param file the file resource
      */
     public FilePropertySource(IFile file) {
         super(file);
     }

     /**
      * Get a PropertyDescriptor that defines the size property
      * @return the PropertyDescriptor
      */
     private static PropertyDescriptor getInitialPropertyDescriptor() {
         return fileDescriptor;
     }

     /* (non-Javadoc)
      * Method declared on IPropertySource.
      */
     public IPropertyDescriptor[] getPropertyDescriptors() {
         IPropertyDescriptor[] superDescriptors = super.getPropertyDescriptors();
         int superLength = superDescriptors.length;
         IPropertyDescriptor[] fileDescriptors = new IPropertyDescriptor[superLength + 1];
         System.arraycopy(superDescriptors, 0, fileDescriptors, 0, superLength);
         fileDescriptors[superLength] = getInitialPropertyDescriptor();

         return fileDescriptors;
     }

     /* (non-Javadoc)
      * Method declared on IPropertySource.
      */
     public Object getPropertyValue(Object key) {
         Object returnValue = (key.equals(IBasicPropertyConstants.P_TEXT)) ? TextProcessor
                 .process(element.getName())
                 : super.getPropertyValue(key);

         if (returnValue != null) {
             return returnValue;
         }

         if (key.equals(IResourcePropertyConstants.P_SIZE_RES)) {
             return IDEResourceInfoUtils.getSizeString((IFile) element);
         }
         return null;
     }
 }

